Great precision metal fabrication

Process characteristics and uses of sheet metal

Sheet metal is a comprehensive cold working process for thin metal sheets (usually below 6mm), including shearing, punching/cutting/laminating, folding, welding, riveting, splicing, forming (e.g. auto body), etc.. The distinguishing feature is the consistent thickness of the same part.

With the characteristics of light weight, high strength, electrical conductivity (able to be used for electromagnetic shielding), low cost, and good performance in mass production, sheet metal is widely used in electronic appliances, communication, automotive industry, medical devices, etc. For example, in computer cases, cell phones, and MP3, sheet metal is an essential component.　As the application of sheet metal becomes more and more widespread, the design of sheet metal parts becomes a very important part of the product development process. Mechanical engineers must master the design skills of sheet metal parts, so that the designed sheet metal can meet the requirements of both the function and appearance of the product, and also make the stamping die manufacturing simple and low cost.

There are many sheet metal materials suitable for stamping, which are widely used in the electrical and electronic industry, including.

 1.ordinary cold-rolled sheet （SPCC） SPCC refers to the ingot through the cold rolling mill continuous rolling into the required thickness of steel coil or sheet, SPCC surface without any protection, exposed to the air is very easy to be oxidation, especially in a humid environment oxidation speed up, the appearance of dark red rust, in use when the surface to paint, electroplating or other protection.

2.Peal Galvanized Steel Sheet （SECC） The substrate of SECC is a general cold rolled steel coil, which becomes galvanized product after degreasing, pickling, plating and various post-treatment processes in the continuous galvanized production line, SECC not only has the mechanical properties and similar processability of general cold rolled steel sheet, but also has superior corrosion resistance and decorative appearance. It is a competitive and alternative product in the market of electronic products, home appliances and furniture. For example, SECC is commonly used in computer cases.

3.SGCC is a hot-dipped galvanized steel coil, which is made by cleaning and annealing semi-finished products after hot pickling or cold rolling, and then dipping them into a molten zinc bath at a temperature of about 460°C to coat them with zinc, followed by a leveling and chemical treatment.

4.Singled stainless steel （SUS301） has a lower Cr (chromium) content than SUS304 and is less resistant to corrosion, but it is cold processed to obtain good tensile strength and hardness, and is more flexible.

5.Stainless steel （SUS304） is one of the most widely used stainless steels. It is more resistant to corrosion and heat than steel containing Cr (chromium) because of its Ni (nickel) content, and has very good mechanical properties.

Workflow of assembly

Assembly, refers to the assembly of parts in accordance with the specified technical requirements, and after debugging, inspection to make it a qualified product process, assembly begins with the design of the assembly drawings.

Products are composed of a number of parts and components. According to the specified technical requirements, a number of parts into components or a number of parts and components into the product of the labor process, known as assembly. The former is called component assembly, the latter is called total assembly. It generally includes assembly, adjustment, inspection and testing, painting, packaging and other work.

Assembly must have two basic conditions of positioning and clamping.

1. Positioning is to determine the correct location of the parts of the process.

2. Clamping is the positioning of the parts fixed

Assembly process contains the following.

1.To ensure the quality of product assembly, and strive to improve the quality in order to extend the life of the product.

2.Reasonable arrangement of the assembly sequence and process, minimize the amount of manual labor of the clampers, shorten the assembly cycle and improve assembly efficiency.

3. To minimize the assembly footprint and improve the productivity of the unit area.

4.To minimize the cost of assembly work accounted for.